According to Barbara Intermill, a registered dietitian nutritionist, fresh veggies certainly are best if available…and if they don’t lose precious nutrients by overcooking or languishing too long in the fridge. Frozen and canned varieties are picked at the peak of ripeness and generally processed right away, which helps maintain nutrients. The current 2020–2025 Dietary Guidelines for Americans encourage people to eat a variety of vegetables including “fresh, frozen and canned.”